Bottom-screw cam for gill-drawing frames



July 21, 1925.

. 1,547,110 H. FIELDHOUSE BOTTOM SCREW cm FOR GILL DRAWING FRAMES Filed July 14. 1924 2 Sheets-Sheet 1 jinr l 'ldhouse MIL dlz rngyzs July 21, 1925. 1,547,110 H. FIELDHOUSE BOTTOM SCREW CAM FOR GILL DRAWING FRAMES Filed July 14. 1924 2 Sheets-Sheet 2 Z27: ,zizzplj i ldh ouse Patented July 21, 1925.

HENRY FIELDHOUSE, OF WORCESTER,

IvTASSACI-IUSETTS, ASSIGNED? TO GILL SCREW ASSOCIATES, INC, OF WORCESTER, MASSACHUSETTS, A CORPORATION 01 MA$SA- CHUSETTS.,

BOTTOM-SCREW CAM FOR GILL-DRAWING FRAMES.

Application filed July 14, 1924. Serial No. 725,869.

To all whom. it may concern:

Be it known that I, HENRY F IELDHoUsE, a citizen of the United States, residing at Worcester, in the county of Worcester and State of Massachusetts, have invented a new and useful Bottom-Screw Cam for Gill- Drawing Frames, of which the following is a specification.

This invention relates to the cams on the bottom screws for lifting the faller bars in gill drawing frames. As previously constructed, these cams are quite wide circumferentially and the result was that the thread of the top screw could not be made complete up to the cam.

The objects of this invention are to pro- Vide cams in such form that they can be made comparatively narrow in a circumferential direction and that theywill not interfere with the threads so that the threads of the top screw can be formed substantially complete clear up to the cam itself; to avoid cutting a clearance groove all the way through the circumference of the cam by orming it with a continuous wall all the way to the circumference; and to strengthen the cam very materially.

Other objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accompany ing drawings, in which:

Fig. 1 is a side elevation of one end of the top and bottom screws of a gill drawing frame, showing a preferred embodiment of this invention applied to the bottom screw;

Fig. 2 is an end elevation of the cam and faller bar at the start of the lifting motion;

Fig. 3 is a plan of the same, and

Figs. 4 and 5 are similar views at the end of the lifting motion.

I have shown the invention as applied to a gill drawing frame of well known form having a bottom screw 10 and a top screw 11 geared in the usual way and acting in the same relation to each other as is common in this art. This invention relates to the-cam 12 on the bottom screw for lifting the faller bar 13 up into engagement with the top screw to be taken into control thereby and moved across the machine.

There are two of the cams 12 as usual mounted on a collar or disc 9 provided with a hub and key and also secured by set screws illustrated herein is in the shape of these cams 12. Each one of them, as has been the case heretofore, has a circular are at the in ner and outer ends and these arcs, of course, are concentric. The forward face 15 of the cam is almost radial. That is, it is parallel to a radial line drawn to about the center of the cam. The rear face 16 is also substantially parallel to the front face. The end face is fiat except for the fact that it is slanted oil at 17 slightly ,for clearance of the faller bar on the other cam. There is no groove around the outer and front corner of the cam as has been the case heretofore but the metal at this point 18 is continuous. This corner is rounded off at the front and extends ,backwardly a short disstance continuously and flush with the circular are on the outside of the cam but at a short distance back it is cut away to form a slanting groove 19 from the edge of the collar 9 to a point more than half way across it. This is important because it provides a space for receiving the end of the thread of the top screw and thus permits of extending that thread farther toward the end. This enables the top screw to get control of the fallerbar earlier and prevent its tilting and becoming locked, and adds to its strength.

This shape is such that when the cam comes around it will lift the faller bar all the way up to the circumference of the collar 9 without the edge of the bar falling into any groove at all prior to that. Having raised it clear up to the circumference, the slanting edge of the faller bar will slide out over the surface next to the groove 19 as the rotation of the cam proceeds and the faller moves under the control of the top screw. One advantage is that as the cam is considerably narrower than has been the case heretofore the thread of the top screw can be made continuous and need not be cut away to provide a space for the cam. Also the narrower cam has more strength, especially as the groove 19 is not continued all the way through it.

Although I have illustrated and described only a single form of the invention I am aware of the fact that modifications can be made therein by any person skilled r to in the art and that it can be used for general purposes without departing from the scope of the invention as expressed in the claims.

Therefore, I do not wish to be limited to all the details of construction herein shown and described, but what I do claim is 1. As an article of manufacture, a oottom screw cam for a gill drawing frame having a relatively short dimension circumferentially substantially equal to its radial dimension, the forward face being continuous all the way to the outer end at the circumference and having at the outer forward corner a rounded continuous surface all the way across axially, and a slanting groove back of said continuous face but terminating short of it to allow for the passage of the end of the thread of the top screw.

2. As an article of manufacture, a bottom screw cam for a gill drawing frame having substantially fiat and parallel forward and rear faces, the forward face being continuous all the way to the outer end at the circumference, and a groove back of said continuous face to allow for the passage of the end of the thread of the top screw, the opposite corner being slanted off to allow for the passage of the faller bar when in contact with the opposite cams.

3. As an article of manufacture, a bottom screw cam for a gill drawing frame having a relatively short dimension circumferentially and having substantially flat and parallel forward and rear faces, the forward face being continuous all the way to the outer end at the circumference and having at the outer forward corner a rounded continuous surface all the way across, and a slanting groove back of said continuous face to allow for the passage of the end of the thread of the top screw, the opposite corner being slanted off to allow for the passage of the faller bar when in contact with the opposite cam.

4. The combination with a bottom screw and a top screw having a thread extending substantially to its end, of a pair of bottom screw cams having solid forward outer corners for supporting the faller bar at the same distance from the center of the bottom screw irrespective of the distance of the bar from the flange of the cam, and having slanting grooves back of said corners, but not passing through them, for receiving the extreme end of the top' thread and permitting of its extension substantially to the end of the screw.

In testimony whereof I have hereunto affixed my signature.

HENRY FIELDHOUSE. 

